{
  "bibcode": "2010GCN.10620....1A",
  "body": "L.A. Antonelli, J.R. Maund, E. Palazzi, P. Goldoni, S.D. Vergani, H. Flores, A. de Ugarte Postigo, S. Covino, J. Fynbo, J. Hjorth, D. Malesani, J. Sollerman, C.C. Thoene, on  behalf of the X-shooter GRB collaboration report:\n\n\n\nWe observed the field of GRB 100418A (Marshall et al. 2010, GCN 10612) with VLT/X-Shooter at Cerro Paranal (Chile). The observation started on Apr 19, at 5:32 UT (about 8.37 hrs after the burst) under very good observing conditions (seeing about 0.7\").  The object reported by Filgas and Greiner (GCN 10617) is clearly seen in our image at flux level of R = 18.1+/- 0.1 mag calibrated against USNO B.1 catalog. \n\nSpectra were acquired and in a preliminary analysis they show an abundance of UV absorption lines (Fe II, Mg II, Mg I, Mn II, Ca H,K) as well as [O II] emission at z = 0.6235 (wavelength calibration was obtained with archive calibration data).\n\nWe acknowledge the Paranal staff for the support.",
  "circularId": 10620,
  "createdOn": 1271667373000,
  "email": "stefano.covino@brera.inaf.it",
  "subject": "GRB100418A: VLT/X-shooter redshift and photometry",
  "submitter": "Stefano Covino at Brera Astronomical Observatory  <stefano.covino@brera.inaf.it>",
  "eventId": "GRB 100418A"
}